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REHAU PEXa PIPING SYSTEMSPRESSURE LOSS TABLES

2 855.681 en 03.2015

TABLE OF CONTENTS

Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Pressure Loss Tables (supersede all previously published friction loss tables)Table 1: With 100% Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Table 2: With Water+20% Propylene Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Table 3: With Water+50% Propylene Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

For updates to this publication and the most current REHAU technical guidelines, safety information and manufacturers recommendations, visit na.rehau.com/resourcecenter

3855.681 en 03.2015

SCOPE

This technical information applies to the planning, installation and connection of REHAU sustainable products using REHAU's extensive range of PEXa pipes.

Pressure loss tables are typically used when manually designing PEXa piping systems for hydronic applications including radiant heating/cooling, snow and ice melting, soil conditioning, geothermal ground loops, PEX plumbing and water service, energy transfer and outdoor wood boiler. These tables are used to properly size the circulator for the PEXa pipes. The designer must ensure the flow requirement and pressure loss are within the circulator's performance capability. Use the REHAU LoopCAD Software which includes a built-in calculator for pipe pressure losses for additional data not found in these tables.

The designer should also review the pertinent REHAU technical instructions and the REHAU PEXa Limited Warranty before beginning to design a system with PEXa pipes.

After reading the appropriate REHAU Design Guide, designers should attend the Skill Builders Complete seminar offered by the REHAU Academy, where design techniques are more fully explored. Design-ers should also periodically check the REHAU Resource Center for the latest updates to the technical instructions.

If you do not have prior experience with hydronic heating systems or require additional assistance, please contact your regional REHAU sales office.

4 855.681 en 03.2015

Table 1A: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe With 100% Water

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

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Table 1A: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe with 100% Water

Flow

Rate

GPM 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4"

0.1 0.3 0.2 0.1 0.1 0.18 0.06 0.03 0.01 0.09 0.03 0.01

5855.681 en 03.2015

Table 1B: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe With 100% Water

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 2 / 15

Table 1B: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe with 100% Water

Flow

Rate

GPM 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2"

1 0.5 0.4 0.3 0.1 0.11 0.04 0.01

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Table 1C: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 100% Water

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 3 / 15

Table 1C: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe with 100% Water

Flow

Rate

GPM 10.1 25 32 40 10.1 25 32 40 10.1 25 32 40 10.1 25 32 40

0.1 0.4 0.1

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Table 1D: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 100% Water

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe. Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307. Example: 1 psi = 2.307 ft of head.

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Table 1D: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe with 100% Water

Flow

Rate

GPM 50 63 75 90 50 63 75 90 50 63 75 90 50 63 75 90

2 0.3 0.2 0.1 0.1 0.02

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Table 1E: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 100% Water

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

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Table 1E

Flow

Rate

GPM 110 125 140 160 110 125 140 160 110 125 140 160 110 125 140 160

5 0.2 0.1 0.1 0.1

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Table 2A: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe With 80% Water / 20% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 6 / 15

Table 2A: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe with 80% Water / 20% Propylene Glycol

Flow

Rate

GPM 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4"

0.1 0.3 0.2 0.1 0.1 0.38 0.11 0.05 0.03 0.16 0.05 0.02 0.01 0.09 0.03 0.01

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Table 2B: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe With 80% Water / 20% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 7 / 15

Table 2B: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe with 80% Water / 20% Propylene Glycol

Flow

Rate

GPM 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2"

1 0.5 0.4 0.3 0.1 0.11 0.05 0.02

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Table 2C: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 80% Water / 20% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 8 / 15

Table 2C: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe with 80% Water / 20% Propylene Glycol

Flow

Rate

GPM 10.1 25 32 40 10.1 25 32 40 10.1 25 32 40 10.1 25 32 40

0.1 0.4 0.1

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Table 2D: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 80% Water / 20% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 9 / 15

Table 2D: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe with 80% Water / 20% Propylene Glycol

Flow

Rate

GPM 50 63 75 90 50 63 75 90 50 63 75 90 50 63 75 90

2 0.3 0.2 0.1 0.1 0.02

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Table 2E: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 80% Water / 20% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

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Table 2E:

Flow

Rate

GPM 110 125 140 160 110 125 140 160 110 125 140 160 110 125 140 160

5 0.2 0.1 0.1 0.1

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Table 3A: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe With 50% Water / 50% Propylene Glyco

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 11 / 15

Table 3A: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe with 50% Water / 50% Propylene Glycol

Flow

Rate

GPM 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4" 3/8" 1/2" 5/8" 3/4"

0.1 0.3 0.2 0.1 0.1 1.31 0.40 0.19 0.10 0.38 0.12 0.06 0.03 0.17 0.05 0.03 0.01

0.2 0.6 0.3 0.2 0.2 2.63 0.80 0.38 0.21 0.77 0.23 0.11 0.06 0.35 0.11 0.05 0.03

0.3 0.9 0.5 0.4 0.3 3.94 1.20 0.57 0.31 1.15 0.35 0.17 0.09 0.96 0.16 0.08 0.04

0.4 1.3 0.7 0.5 0.4 5.26 1.60 0.76 0.41 1.53 0.47 0.22 0.12 1.56 0.39 0.10 0.05

0.5 1.6 0.9 0.6 0.4 6.57 2.00 0.95 0.51 1.92 0.58 0.28 0.15 2.27 0.56 0.23 0.07

0.6 1.9 1.0 0.7 0.5 7.89 2.39 1.14 0.62 2.30 0.70 0.33 0.18 3.10 0.76 0.32 0.16

0.7 2.2 1.2 0.8 0.6 9.20 2.79 1.33 0.72 5.23 0.82 0.39 0.21 4.04 0.99 0.41 0.20

0.8 2.5 1.4 1.0 0.7 10.5 3.19 1.52 0.82 6.54 0.93 0.44 0.24 5.09 1.24 0.52 0.25

0.9 2.8 1.6 1.1 0.8 11.8 3.59 1.71 0.92 7.98 1.97 0.50 0.27 6.24 1.52 0.63 0.31

1.0 3.2 1.7 1.2 0.9 13.1 3.99 1.90 1.03 9.54 2.35 0.99 0.30 7.50 1.82 0.76 0.37

1.2 3.8 2.1 1.4 1.1 15.8 4.79 2.28 1.23 13.0 3.19 1.34 0.65 10.3 2.49 1.03 0.50

1.4 4.4 2.4 1.7 1.2 18.4 5.59 2.66 1.44 16.9 4.14 1.73 0.84 13.5 3.25 1.35 0.65

1.6 5.0 2.8 1.9 1.4 21.0 6.39 3.04 1.64 21.3 5.20 2.17 1.05 17.1 4.10 1.69 0.82

1.8 5.7 3.1 2.2 1.6 23.7 7.18 3.42 1.85 26.1 6.36 2.65 1.29 21.1 5.04 2.08 1.00

2.0 6.3 3.5 2.4 1.8 26.3 7.98 3.80 2.05 31.3 7.61 3.17 1.54 25.4 6.06 2.50 1.20

2.2 6.9 3.8 2.6 1.9 53.8 8.78 4.18 2.26 37.0 8.97 3.73 1.81 30.1 7.17 2.95 1.42

2.4 7.6 4.2 2.9 2.1 62.3 9.58 4.56 2.46 43.1 10.4 4.32 2.09 35.2 8.36 3.43 1.65

2.6 8.2 4.5 3.1 2.3 71.2 10.4 4.94 2.67 49.5 12.0 4.96 2.40 40.7 9.63 3.95 1.90

2.8 8.8 4.9 3.4 2.5 80.7 20.0 5.32 2.88 56.4 13.6 5.63 2.72 46.5 11.0 4.50 2.16

3.0 9.5 5.2 3.6 2.6 90.6 22.4 5.70 3.08 63.7 15.3 6.34 3.07 52.7 12.4 5.08 2.44

3.2 5.6 3.8 2.8 25.0 6.08 3.29 17.2 7.09 3.42 13.9 5.70 2.73

3.4 5.9 4.1 3.0 27.6 11.6 3.49 19.1 7.87 3.80 15.5 6.34 3.04

3.6 6.3 4.3 3.2 30.4 12.7 3.70 21.1 8.69 4.19 17.2 7.02 3.36

3.8 6.6 4.6 3.3 33.3 13.9 3.90 23.1 9.55 4.60 18.9 7.73 3.69

4.0 6.9 4.8 3.5 36.3 15.2 7.41 25.3 10.4 5.03 20.8 8.46 4.04

4.2 7.3 5.0 3.7 39.4 16.5 8.03 27.6 11.4 5.47 22.7 9.23 4.41

4.4 7.6 5.3 3.9 42.6 17.8 8.68 29.9 12.3 5.93 24.6 10.0 4.79

4.6 8.0 5.5 4.1 46.0 19.2 9.35 32.4 13.3 6.41 26.7 10.9 5.18

4.8 8.3 5.7 4.2 49.4 20.6 10.0 34.9 14.3 6.90 28.8 11.7 5.59

5.0 8.7 6.0 4.4 52.9 22.1 10.7 37.5 15.4 7.41 31.0 12.6 6.01

5.5 9.6 6.6 4.8 62.2 26.0 12.6 44.4 18.2 8.75 36.9 15.0 7.12

6.0 7.2 5.3 30.1 14.6 21.2 10.2 17.5 8.31

6.5 7.8 5.7 34.5 16.7 24.4 11.7 20.2 9.60

7.0 8.4 6.2 39.1 19.0 27.9 13.3 23.1 11.0

7.5 9.0 6.6 44.0 21.3 31.5 15.1 26.2 12.4

8.0 9.6 7.0 49.1 23.8 35.3 16.9 29.4 13.9

8.5 7.5 26.4 18.8 15.6

9.0 7.9 29.1 20.8 17.2

9.5 8.4 31.9 22.9 19.0

10.0 8.8 34.8 25.0 20.9

11.0 9.7 41.0 29.7 24.8

Flow Velocity above Shown is pressure To express

8 feet per second may be loss in units of pressure loss in

considered excessive and psi per 100 ft terms of

may result in excessive of pipe. feet of head,

pressure loss, noise or multiply the value

erosion of system Example: for 200 listed by 2.307.

components. lineal ft of pipe,

double the value Example: 1 psi =

listed in this table. 2.307 ft of head

Flow Velocity pressure loss in psi per 100 ft of pipe

ft/sec 60F (16C) 50% Glycol 120F (49C) 50% Glycol 180F (82C) 50% Glycol

15855.681 en 03.2015

Table 3B: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe With 50% Water / 50% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 12 / 15

Table 3B: Pressure Loss for Inch-Sized SDR9 REHAU PEXa Carrier Pipe with 50% Water / 50% Propylene Glycol

Flow

Rate

GPM 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2" 1" 1-1/4" 1-1/2" 2"

1 0.5 0.4 0.3 0.1 0.38 0.17 0.09 0.03 0.11 0.05 0.03

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Table 3C: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 50% Water / 50% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 13 / 15

Table 3C: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe with 50% Water / 50% Propylene Glycol

Flow

Rate

GPM 10.1 25 32 40 10.1 25 32 40 10.1 25 32 40 10.1 25 32 40

0.1 0.4 0.1

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Table 3D: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 50% Water / 50% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

pressureloss_raupex_rautherm_2013.04-emailonly.xlsx lee 2163, Page 14 / 15

Table 3D: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe with 50% Water / 50% Propylene Glycol

Flow

Rate

GPM 50 63 75 90 50 63 75 90 50 63 75 90 50 63 75 90

2 0.3 0.2 0.1 0.1 0.06 0.03 0.01

18 855.681 en 03.2015

Table 3E: Pressure Loss for Metric-Sized SDR11 REHAU PEXa Carrier Pipe With 50% Water / 50% Propylene Glycol

Flow velocity above 8 fps (2.5 m/s) might result in excessive pressure loss, noise or erosion of the system components. Table values shown in pressure loss units of psi per 100 ft (30.5 m) of pipe.

Example: for 200 lineal ft of pipe, double the value listed in this table. To express pressure loss in terms of feet of head, multiply the table value by 2.307.

Example: 1 psi = 2.307 ft of head.

2.20150309-pressureloss_raupex_rautherm(emailcopyonly) (1).xlsx lee 2163, Page 1 / 1

Table 3E:

Flow

Rate

GPM 110 125 140 160 110 125 140 160 110 125 140 160 110 125 140 160

5 0.2 0.1 0.1 0.1

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For updates to this publication, visit na.rehau.com/resourcecenter

The information contained herein is believed to be reliable, but no representations, guarantees or warranties of any kind are made as to its accuracy, suitability for particular applications or the results to be obtained therefrom. Before using, the user will determine suitability of the information for users intended use and shall assume all risk and liability in connection therewith. 2015 REHAU

855.681 en 03.2015